Same song, different verse

We have tons of Common Wood-Nymphs (Cercyonis pegala) at home in Texas and Oklahoma, but that didn't stop me from wondering what a bunch of fluttery, dark brown butterflies were in Alberta this summer.  They look pretty different.  They also were very flighty so it took me a while to get close enough for pictures. It turned out they were the same species!

I present an example of a wood-nymph from Texas:

A Common Wood-Nymph on lotebush flowers, Wilbarger County, Texas, 23 June 2005

And an Alberta wood-nymph:

On a thistle, near Brooks, Alberta.  28 July 2014.